I'm fairly thick-skinned. However, I'll take an outright cussing before I'll be called a liar. If a man wants to go there, he'd better put up or shut up. I look at it this way, if I'm called a liar, that person gets a fair chance to put their cards on the table. If it turns out they're right, it's up to me to man up and own the error of my ways. If it turns out they're full of bull, well, then it's gonna get interesting. And with that, I'll get off my soapbox.
To be honest, I thought he initially did a good job of keeping his cool, and a fair job of speaking his mind. Alas, when it came to backing anything up with actual data or facts, he chose poorly. The result speaks for itself.
We're here to educate ourselves and newcomers, differences of opinion aren't only expected, they're genuinely welcomed. The caveat is that there has to be valid data at the heart of your disagreement. Otherwise it's just an argument for the sake of arguing and nobody learns anything except who the most assertive and stubborn participant happens to be....